A transient electromagnetic prospecting system and method based on controllable source compensation

Abstract

The invention relates to the field of geophysical prospecting equipment, in particular to a transient electromagnetic prospecting system and method based on controllable source compensation. The transient electromagnetic prospecting system comprises a transmitting device, a receiving device, a compensating device and an industrial personal computer, wherein the transmitting device comprises a transmitting controller and a transmitting coil of which the excitation current is controlled by the transmitting controller; the receiving device comprises a receiving controller and a receiving coil which is concentric with the transmitting coil; the compensating device comprises a magnetic sensor, a compensating coil and a compensating controller, the magnetic sensor and the compensating coil are concentric with the transmitting coil, the compensating controller is used for receiving the current of the magnetic sensor to carry out self-adaptive calculation and adjusting the compensating currentin the compensating coil, and the magnetic sensor is used for detecting the magnetic field in the center of the coil and generating a feedback signal when the compensating current is regulated and controlled; the industrial personal computer is in communication connection with the receiving controller and used for displaying the working mode of the system and storing a TEM signals; and the receiving controller transmits synchronization signals, control commands and system parameters to the transmitting controller and the compensating controller. The problem that primary field interference istoo large is solved, the selection precision of the compensating current is improved, and high-precision compensation is realized.

Description

technical field [0001] The invention relates to the field of geophysical prospecting equipment, in particular to a transient electromagnetic prospecting system and method based on controllable source compensation. Background technique [0002] Transient Electromagnetic Method (TEM) is a geophysical exploration method based on the law of electromagnetic induction. Due to its sensitivity to low-resistivity bodies, it has become the preferred method for geological problems such as geological structure exploration and geological mineral exploration. . The total length of the emission line of the ground TEM is tens of meters to hundreds of meters, and the inductance of the coil cannot be ignored, which prevents the excitation current from being cut off immediately. Therefore, during this off-time, the receiving coil is coupled with the primary field signal generated by the transmitting coil in addition to the early secondary field signal. Since the early signal of TEM comes fro...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a transient electromagnetic exploration system and method based on controllable source compensation to solve the problem of excessive primary field interference

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